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  1. By: Watson, Gary W.
    Type: Article
    In: Arnoldia
    Volume: 56
    Issue: 4
    Date: 1996
    Page Range: 11--16
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Watson, Gary W. - Clark, Sandra
    Type: Article
    In: Arnoldia
    Volume: 56
    Issue: 1
    Date: 1996
    Page Range: 15--21
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University